JP2000046801A - Method and apparatus for inspecting permanent magnet - Google Patents
Method and apparatus for inspecting permanent magnetInfo
- Publication number
- JP2000046801A JP2000046801A JP10228709A JP22870998A JP2000046801A JP 2000046801 A JP2000046801 A JP 2000046801A JP 10228709 A JP10228709 A JP 10228709A JP 22870998 A JP22870998 A JP 22870998A JP 2000046801 A JP2000046801 A JP 2000046801A
- Authority
- JP
- Japan
- Prior art keywords
- permanent magnet
- image
- inspection
- permanent magnets
- magnet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000007689 inspection Methods 0.000 claims abstract description 28
- 230000007246 mechanism Effects 0.000 claims abstract description 22
- 230000005291 magnetic effect Effects 0.000 claims abstract description 14
- 239000000843 powder Substances 0.000 claims abstract description 13
- 230000007723 transport mechanism Effects 0.000 claims description 9
- 238000010191 image analysis Methods 0.000 claims description 8
- 230000007547 defect Effects 0.000 abstract description 9
- 238000005204 segregation Methods 0.000 abstract description 6
- 230000000007 visual effect Effects 0.000 abstract description 3
- 230000005381 magnetic domain Effects 0.000 description 5
- 239000000084 colloidal system Substances 0.000 description 3
- 238000013517 stratification Methods 0.000 description 3
- 238000011179 visual inspection Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000006059 cover glass Substances 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 239000003302 ferromagnetic material Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- CIOAGBVUUVVLOB-UHFFFAOYSA-N strontium atom Chemical compound [Sr] CIOAGBVUUVVLOB-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Landscapes
- Measuring Magnetic Variables (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、永久磁石の検査手
段に関し、とくに永久磁石表面のきず、偏析等の有無に
ついての検査方法と検査装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for inspecting a permanent magnet, and more particularly to an inspection method and an inspection apparatus for checking for flaws, segregation and the like on the surface of a permanent magnet.
【０００２】[0002]
【従来の技術】永久磁石は、回転機器、磁性物質の吸脱
着、さらにはセンサーなど、様々な分野に使用されてい
る。特に、近年は、例えば、ＭＲＩ装置に代表される大
型機器、又マイクロマシンに代表される超小型機器等、
広範な分野に使用されており、永久磁石に対する要求条
件も多岐にわたっている。2. Description of the Related Art Permanent magnets are used in various fields such as rotating equipment, adsorption and desorption of magnetic substances, and sensors. In particular, in recent years, for example, large equipment represented by an MRI apparatus, ultra-small equipment represented by a micromachine, etc.
It is used in a wide range of fields, and the requirements for permanent magnets are also diverse.
【０００３】このような背景の中、永久磁石の品質に対
する要求条件は厳しさを増している。例えば、不可避的
に発生する微細な表面クラックや、組織上の微視的な偏
析の、許容範囲が大幅に狭くなってきた。品質検査方法
の主流をなしてきた、目視並びに拡大鏡による従来の外
観検査では、層別を行うことが困難になっている。[0003] Against this background, the requirements for the quality of permanent magnets are becoming more stringent. For example, tolerances for unavoidable fine surface cracks and microscopic segregation on the structure have been significantly narrowed. With the conventional visual inspection using a magnifying glass and the conventional visual inspection which has been the mainstream of the quality inspection method, it is difficult to perform stratification.
【０００４】強磁性材料の磁区観察のために開発された
粉末図形法を、永久磁石にも適用し、永久磁石の微細な
磁気の乱れをもって表面欠陥の有無を目視で検査する方
法が、従来、採られてきた。A method of applying a powder graphic method developed for observing magnetic domains of a ferromagnetic material to a permanent magnet, and visually inspecting the presence or absence of a surface defect with a minute disturbance of the magnetism of the permanent magnet has been conventionally used. Has been taken.
【０００５】粉末図形法は、検査対象物の表面に、カバ
ーグラスを隔てて、滴下した磁性流体といわれる磁性コ
ロイドが、磁壁に凝集し、磁区模様を呈し、磁区図形の
観察に古くから利用されてきた手法である。磁壁のみな
らず、磁性体表面にきずや偏析等による組織の不均一が
ある場合には、一様性を欠いた磁性コロイドのパターン
として表される。粉末図形法は、高価な設備を必要とせ
ず、手軽に実施できる上、１０μｍ程度の表面欠陥をも
見ることができるなどの特徴がある。In the powder pattern method, a magnetic colloid called a magnetic fluid dropped onto a surface of an inspection object with a cover glass interposed therebetween is aggregated on a magnetic domain wall to form a magnetic domain pattern, and has been used for a long time to observe magnetic domain figures. It is a technique that has been. If the surface of the magnetic material has non-uniformity due to flaws, segregation, or the like as well as the domain wall, it is expressed as a pattern of a magnetic colloid lacking uniformity. The powder drawing method has features that it does not require expensive equipment, can be easily implemented, and that surface defects of about 10 μm can be seen.
【０００６】磁性コロイドを収容したセルを検査対象物
の表面に載せるだけで、粉末図形法による磁区図形や表
面欠陥の影響による微細な磁気の乱れ等を観察できるマ
グネットビュアが市販されている。[0006] There is a magnet viewer on the market capable of observing minute magnetic disturbances or the like due to the influence of a magnetic domain figure or a surface defect by simply placing a cell containing a magnetic colloid on the surface of an inspection object.
【０００７】[0007]
【発明が解決しようとする課題】しかし、粉末図形法に
より、多数の永久磁石について、表面欠陥を定量的に目
視で層別することは困難である。However, it is difficult to visually and visually classify surface defects of a large number of permanent magnets by the powder graphic method.
【０００８】本発明は、粉末図形法を利用しつつも、目
視に依存することなく、多数の永久磁石について、表面
のきずや偏析等の欠陥を、定量的に、かつ正確に層別す
る方法と、その装置を提供することを目的とする。The present invention provides a method for quantitatively and accurately stratifying defects such as surface flaws and segregation on a large number of permanent magnets without relying on visual observation while utilizing a powder graphic method. And to provide the device.
【０００９】[0009]
【課題を解決するための手段】本発明による永久磁石の
検査は、粉末図形法によって写し出される永久磁石の表
面における磁界分布の像を、画像解析するとともに、予
め設定された基準と照合し、永久磁石を層別することに
よって行われる。In the inspection of a permanent magnet according to the present invention, an image of a magnetic field distribution on the surface of the permanent magnet projected by a powder graphic method is image-analyzed, collated with a preset reference, and permanently inspected. This is done by stratifying the magnets.
【００１０】本発明による永久磁石の検査装置は、永久
磁石の表面に搭載することによって永久磁石の表面にお
ける磁界分布の像を粉末図形法によって写し出すマグネ
ットビュア、写し出された磁界分布の像を画像解析し、
予め設定された基準と照合し、永久磁石を層別する画像
解析装置から構成される。A permanent magnet inspection apparatus according to the present invention is a magnet viewer mounted on a surface of a permanent magnet to project an image of a magnetic field distribution on the surface of the permanent magnet by a powder graphic method, and an image analysis of the projected image of the magnetic field distribution. And
It is composed of an image analysis device that matches with a preset reference and stratifies the permanent magnets.
【００１１】前記の構成を含み、画像解析装置のもとに
永久磁石を搬送する搬送機構、搬送機構に永久磁石を搭
載する搭載機構、永久磁石を検査する前後に、永久磁石
にマグネットビュアをセッティングし、除去するリフト
機構、２値化方式画像解析装置による検査を終えた永久
磁石を回収し、層別する仕分け機構、および、各機構を
シーケンス動作させる制御器から構成される永久磁石の
検査装置によって、検査の自動化を実現することができ
る。A transport mechanism for transporting a permanent magnet under an image analyzer, a mounting mechanism for mounting a permanent magnet on the transport mechanism, and a magnet viewer set on the permanent magnet before and after the inspection of the permanent magnet. And a sorting mechanism for collecting and layering the permanent magnets that have been inspected by the binarization type image analyzer, and a lift mechanism for removing and removing the permanent magnets, and a controller for performing a sequence operation of each mechanism. As a result, the inspection can be automated.
【００１２】[0012]
【発明の実施の形態】以下に、本発明の実施の形態につ
いて、図面を参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１３】図１は、本発明による永久磁石の検査装置
の構成を示す説明図である。図２は、図１に示す永久磁
石の検査装置のシーケンスダイヤグラムである。FIG. 1 is an explanatory view showing the configuration of a permanent magnet inspection apparatus according to the present invention. FIG. 2 is a sequence diagram of the permanent magnet inspection apparatus shown in FIG.
【００１４】図１に示すように、本発明による永久磁石
の検査装置は、２値化方式画像解析装置２、マグネット
ビュア３、リフト機構６、搬送機構４、搭載機構５、仕
分け機構７、および、これらの各機構をシーケンス動作
させる制御器８から構成されている。As shown in FIG. 1, a permanent magnet inspection apparatus according to the present invention includes a binarization type image analysis apparatus 2, a magnet viewer 3, a lift mechanism 6, a transport mechanism 4, a mounting mechanism 5, a sorting mechanism 7, and , And a controller 8 for operating these mechanisms in sequence.
【００１５】図１において、まず、搭載機構５によって
搬送機構４に搭載された被検査物である永久磁石１は、
搬送機構４によって２値化方式画像解析装置２のもとに
移送される。２値化方式画像解析装置２のもとで、リフ
ト機構６を動作させて永久磁石１の表面にマグネットビ
ュア３をセッティングする。マグネットビュア３には、
永久磁石１の表面の表面における磁界分布が粉末図形法
によって描き出される。この表面における磁界分布を２
値化方式画像解析装置２によって、画像として取り込
み、画像の乱れを解析し、予め設定された基準と照合
し、永久磁石１を層別する。In FIG. 1, first, a permanent magnet 1 as an object to be inspected mounted on a transport mechanism 4 by a mounting mechanism 5 is:
It is transported by the transport mechanism 4 to the binarization type image analyzer 2. Under the binarization type image analyzer 2, the lift mechanism 6 is operated to set the magnet viewer 3 on the surface of the permanent magnet 1. In magnet viewer 3,
The magnetic field distribution on the surface of the surface of the permanent magnet 1 is drawn by the powder graphic method. The magnetic field distribution on this surface is 2
The image is captured as an image by the binarization type image analysis device 2, the disturbance of the image is analyzed, the image is collated with a preset reference, and the permanent magnets 1 are stratified.
【００１６】層別の完了とともに、リフト機構６によっ
てその地点でマグネットビュア３を持ち上げ、その上で
搬送機構４を駆動して新たな永久磁石１を２値化方式画
像解析装置２のもとに移動させる。リフト機構６によっ
て、新たな永久磁石１の表面にマグネットビュア３をセ
ッティングし、当該永久磁石１を層別する。When the stratification is completed, the magnet viewer 3 is lifted at that point by the lift mechanism 6, and the transport mechanism 4 is driven on the magnet viewer 3 to convert the new permanent magnet 1 into the binarized image analysis apparatus 2. Move. The magnet viewer 3 is set on the surface of a new permanent magnet 1 by the lift mechanism 6, and the permanent magnet 1 is stratified.
【００１７】他方、層別された永久磁石１は、その結果
にもとづいて、仕分け機構７によって仕分け回収され
る。On the other hand, the layered permanent magnets 1 are sorted and collected by a sorting mechanism 7 based on the results.
【００１８】これらの一連のシーケンス動作は制御器８
によって制御され、その結果として、多数の永久磁石の
検査を自動的に実行することが可能となる。These series of sequence operations are performed by the controller 8
As a result, the inspection of a large number of permanent magnets can be automatically performed.
【００１９】本永久磁石の検査装置を、ストロンチウム
・フェライト永久磁石の連続検査に適用し、１時間あた
り、１８３５個の処理能力が得られた。その結果は、従
来の目視法の検査に比べて、５倍以上の処理能力に相当
するものであった。The present permanent magnet inspection apparatus was applied to continuous inspection of strontium / ferrite permanent magnets, and a processing capacity of 1,835 pieces was obtained per hour. The result was equivalent to a processing ability five times or more as compared with the conventional visual inspection.
【００２０】なお、前記の連続した多数の永久磁石の検
査に先立ち、２値化方式画像解析装置、およびマグネッ
トビュアの基本要素から構成される単純な永久磁石の検
査装置を用い、Ｓｍ−Ｃｏ系永久磁石を検査した。本検
査方法の結果、画像に乱れがあると判定されたＳｍ−Ｃ
ｏ系永久磁石を、別途、走査型電子顕微鏡にて拡大観察
したところ、明らかに微細な表面欠陥が生じていること
が確認された。他方、画像乱れを発生しなかった永久磁
石も、同様に、走査型電子顕微鏡観察では、表面欠陥は
認められないことから、本発明による永久磁石の検査装
置が十分に信頼できることを確認した。Prior to the inspection of a large number of continuous permanent magnets, an Sm-Co system is used by using a binarization type image analysis apparatus and a simple permanent magnet inspection apparatus composed of basic elements of a magnet viewer. The permanent magnet was inspected. Sm-C determined to be disturbed in the image as a result of this inspection method
When the o-based permanent magnet was separately observed under magnification with a scanning electron microscope, it was confirmed that fine surface defects had clearly occurred. On the other hand, a permanent magnet which did not cause image disturbance also showed no surface defects by scanning electron microscope observation, and thus it was confirmed that the inspection apparatus for a permanent magnet according to the present invention was sufficiently reliable.
【００２１】[0021]
【発明の効果】以上、説明したように、本発明によっ
て、粉末図形法を利用しつつも、目視に依存することな
く、多数の永久磁石について、表面のきずや偏析等の欠
陥を、定量的に、かつ正確に層別することが自動化でき
るようになった。As described above, according to the present invention, defects such as surface flaws and segregation can be quantitatively determined for a large number of permanent magnets by utilizing the powder graphic method without depending on visual observation. Automatic and accurate stratification is now possible.
【図１】本発明による永久磁石の検査装置の構成を示す
説明図。FIG. 1 is an explanatory view showing a configuration of a permanent magnet inspection device according to the present invention.
【図２】図１に示す永久磁石の検査装置のシーケンスダ
イヤグラム。FIG. 2 is a sequence diagram of the permanent magnet inspection apparatus shown in FIG.
１ 永久磁石 ２ ２値化方式画像解析装置 ３ マグネットビュア ４ 搬送機構 ５ 搭載機構 ６ リフト機構 ７ 仕分け機構 ８ 制御器 DESCRIPTION OF SYMBOLS 1 Permanent magnet 2 Binary image analysis device 3 Magnet viewer 4 Transport mechanism 5 Mounting mechanism 6 Lift mechanism 7 Sorting mechanism 8 Controller
Claims (3)
石の表面における磁界分布の像を、画像解析するととも
に、予め設定された基準と照合し、前記永久磁石を層別
することを特徴とする永久磁石の検査方法。An image of a magnetic field distribution on a surface of a permanent magnet projected by a powder graphic method is image-analyzed, collated with a preset reference, and the permanent magnet is stratified. Inspection method.
石の検査装置において、前記永久磁石の表面に搭載する
ことによって該永久磁石の表面における磁界分布の像を
粉末図形法によって写し出すマグネットビュア、前記写
し出された磁界分布の像を画像解析し、予め設定された
基準と照合し、前記永久磁石を層別する画像解析装置か
ら構成されることを特徴とする永久磁石の検査装置。2. A permanent magnet inspection apparatus for inspecting a state of a surface of a permanent magnet, wherein the magnet viewer is mounted on the surface of the permanent magnet to project an image of a magnetic field distribution on the surface of the permanent magnet by a powder graphic method. An inspection apparatus for a permanent magnet, comprising: an image analyzer that analyzes the projected image of the magnetic field distribution, compares the image with a predetermined reference, and stratifies the permanent magnet.
析装置のもとに前記永久磁石を搬送する搬送機構、該搬
送機構に前記永久磁石を搭載する搭載機構、該永久磁石
を検査する前後に、該永久磁石に前記マグネットビュア
をセッティングし、除去するリフト機構、前記画像解析
装置による層別を終えた前記永久磁石を、仕分け、回収
する仕分け機構、および、前記各機構をシーケンス動作
させる制御器から構成されることを特徴とする永久磁石
の検査装置。3. A transport mechanism for transporting the permanent magnet under the image analyzer, a mounting mechanism for mounting the permanent magnet on the transport mechanism, and inspecting the permanent magnet. Before and after, a lift mechanism that sets and removes the magnet viewer on the permanent magnet, a sorting mechanism that sorts and collects the permanent magnets that have been stratified by the image analysis device, and performs a sequence operation of each mechanism. An inspection device for a permanent magnet, comprising a controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10228709A JP2000046801A (en) | 1998-07-28 | 1998-07-28 | Method and apparatus for inspecting permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10228709A JP2000046801A (en) | 1998-07-28 | 1998-07-28 | Method and apparatus for inspecting permanent magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000046801A true JP2000046801A (en) | 2000-02-18 |
Family
ID=16880588
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10228709A Withdrawn JP2000046801A (en) | 1998-07-28 | 1998-07-28 | Method and apparatus for inspecting permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000046801A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007071659A (en) * | 2005-09-06 | 2007-03-22 | Internatl Superconductivity Technology Center | Continuous magnetic flux observation apparatus and method |
| JP2008058054A (en) * | 2006-08-30 | 2008-03-13 | Tdk Corp | Magnetization state determination method and magnetization state determination device of permanent magnet |
| JP2012185155A (en) * | 2011-02-14 | 2012-09-27 | Magcam Nv | Apparatus and method for characterizing magnetic system |
| JP5943140B2 (en) * | 2013-02-25 | 2016-06-29 | 日産自動車株式会社 | Magnet evaluation apparatus and method |
| US10464132B2 (en) | 2013-05-24 | 2019-11-05 | Toyota Jidosha Kabushiki Kaisha | Permanent magnet source powder fabrication method, permanent magnet fabrication method, and permanent magnet raw material powder inspection method |
| CN118237279A (en) * | 2024-05-23 | 2024-06-25 | 莱芜成威电子材料有限公司 | A detection device for magnetic core |
-
1998
- 1998-07-28 JP JP10228709A patent/JP2000046801A/en not_active Withdrawn
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007071659A (en) * | 2005-09-06 | 2007-03-22 | Internatl Superconductivity Technology Center | Continuous magnetic flux observation apparatus and method |
| JP2008058054A (en) * | 2006-08-30 | 2008-03-13 | Tdk Corp | Magnetization state determination method and magnetization state determination device of permanent magnet |
| JP2012185155A (en) * | 2011-02-14 | 2012-09-27 | Magcam Nv | Apparatus and method for characterizing magnetic system |
| US9739843B2 (en) | 2011-02-14 | 2017-08-22 | Magcam Nv | Arrangement and method for characterizing magnetic systems |
| JP5943140B2 (en) * | 2013-02-25 | 2016-06-29 | 日産自動車株式会社 | Magnet evaluation apparatus and method |
| US10464132B2 (en) | 2013-05-24 | 2019-11-05 | Toyota Jidosha Kabushiki Kaisha | Permanent magnet source powder fabrication method, permanent magnet fabrication method, and permanent magnet raw material powder inspection method |
| CN118237279A (en) * | 2024-05-23 | 2024-06-25 | 莱芜成威电子材料有限公司 | A detection device for magnetic core |
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